Emil Alphonse Werneк .XCIV.—The constitution of carbamides. Part IX. The interaction of nitrous acid and mono-substituted ureas. The preparation of diazomethane, diazoethane, diazo-n-butane, and diazoisopentane from the respective nitrosoureas//. J. Chem. Soc., Trans., 1919, 115, 1093 - 1102
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http://dx.doi.org/10.1039/CT9191501093